成岩作用及阶段对碎屑岩储层孔隙演化的控制

Reservoirs Pores Evolution under the Control of Diagenesis and Stage

碎屑岩储层孔隙演化受有机──无机成岩作用的影响，在埋藏成岩阶段．有机质成热过程中脱羧作用产生的有机酸对碎屑岩中的方解石、长石等溶蚀所形成的次生孔隙，是深部储层中高孔渗段发育的重要原因，随埋深增加，成岩阶段由早→晚发展，有机质由未成熟→成熟演化，在此期间，储层孔隙经历了消亡与新生的发展过程。在同一盆地中，不同层位储层经历的是大埋深如果相近，所处成岩阶段也相近，其孔隙演化史亦趋于相似；反之，同一层位的储层所处的最大理深不同，成岩阶段不同，其孔隙特征也就不同。

Clastic rock reservoirs pores evolution is affected by organic-inorganic diagenesis. Atthe buried diagenesis stages, the important cause for,high Porosity and permeability in deep-buried reservoirs is the secondary pores produced by the corrosion of calcite and feldsparfrom the process of the dehydroxylation of organic acid, in thermal evolution. With the increase of buried depth, diagenesis stagds will experience an evolution from early to late phases, and organic matter from non-maturity to maturity. Meanwhile, the reservoirs poreswill also undergo an evolution from decline to re-growth. In the same,basin, if the reservoirs in different beds possess the same buried depth, their diagenesis phases and pores lution will be the same. Otherwise, even the reservoirs in the same beds will have differentdiaginesis phases and pores evolution.